Properties of galaxies around the most massive SMBHs

摘要

We present result of the clustering analysis performed between AGNs and galaxies. AGN samples with redshift 0.1-1.0 were extracted from AGN properties catalogs which contain virial mass estimates of SMBHs. Galaxy samples were extracted from SDSS DR8 catalog and UKIDSS DR9 LAS catalog. The catalogs of SDSS and UKIDSS were merged and used to estimate the IR-opt color and IR magnitude in the rest frame by SED fitting. As we had no redshift information on the galaxy samples, stacking method was applied. We investigated the BH mass dependence of cross correlation length, red galaxy fraction at their environment, and luminosity function of galaxies. We found that the cross correlation length increase above Mbh ≥ 10~(8.2) M_⊙, and red galaxies dominate the environment of AGNs with M_(BH) ≥ 10~9 M_⊙. This result indicates that the most massive SMBHs are mainly fueled by accretion of hot halo gas.